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Add: 4x^(2) - 7xy + 4y^(2) - 3, 5 + 6y...

Add:
`4x^(2) - 7xy + 4y^(2) - 3, 5 + 6y^(2) - 8xy + x^(2)` and `6 - 2xy + 2x^(2) - 5y^(2)`

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